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<li><p>JSON(JavaScript Object Notation, JS 对象标记) 是一种轻量级的数据交换格式，目前使用特别广泛。</p>
</li>
<li><p>采用完全独立于编程语言的<strong>文本格式</strong>来存储和表示数据。</p>
</li>
<li><p>对象表示为键值对，数据由逗号分隔</p>
</li>
<li><p>花括号保存对象</p>
</li>
<li><p>方括号保存数组</p>
</li>
</ul>
<p><strong>JSON 数据的书写格式是：名称/值对。</strong></p>
<p><strong>名称/值对包括字段名称（在双引号中），后面写一个冒号，然后是值：</strong></p>
<figure class="highlight json"><table><tr><td class="code"><pre><span class="line"><span class="punctuation">&#123;</span><span class="attr">&quot;name&quot;</span> <span class="punctuation">:</span> <span class="string">&quot;乔治&quot;</span><span class="punctuation">&#125;</span></span><br><span class="line"><span class="punctuation">&#123;</span><span class="attr">&quot;age&quot;</span><span class="punctuation">:</span> <span class="string">&quot;23&quot;</span><span class="punctuation">&#125;</span></span><br><span class="line"><span class="punctuation">&#123;</span><span class="attr">&quot;sex&quot;</span><span class="punctuation">:</span> <span class="string">&quot;男&quot;</span><span class="punctuation">&#125;</span></span><br></pre></td></tr></table></figure>

<span id="more"></span>

<p><strong>JSON 对象在大括号（{}）中书写：</strong></p>
<p><strong>对象可以包含多个名称/值对：</strong></p>
<figure class="highlight json"><table><tr><td class="code"><pre><span class="line"><span class="punctuation">&#123;</span> <span class="attr">&quot;name&quot;</span><span class="punctuation">:</span><span class="string">&quot;乔治&quot;</span> <span class="punctuation">,</span> <span class="attr">&quot;url&quot;</span><span class="punctuation">:</span><span class="string">&quot;www.pg.com&quot;</span> <span class="punctuation">&#125;</span></span><br></pre></td></tr></table></figure>



<h4 id="JSON-数组"><a href="#JSON-数组" class="headerlink" title="JSON 数组"></a>JSON 数组</h4><p><strong>JSON 数组在中括号中书写：</strong></p>
<p><strong>数组可包含多个对象：</strong></p>
<figure class="highlight json"><table><tr><td class="code"><pre><span class="line"><span class="punctuation">&#123;</span></span><br><span class="line">    <span class="attr">&quot;sites&quot;</span><span class="punctuation">:</span> <span class="punctuation">[</span> </span><br><span class="line">        <span class="punctuation">&#123;</span> <span class="attr">&quot;name&quot;</span><span class="punctuation">:</span><span class="string">&quot;乔治&quot;</span> <span class="punctuation">,</span> <span class="attr">&quot;url&quot;</span><span class="punctuation">:</span><span class="string">&quot;www.pg.com&quot;</span> <span class="punctuation">&#125;</span><span class="punctuation">,</span>  </span><br><span class="line">        <span class="punctuation">&#123;</span> <span class="attr">&quot;name&quot;</span><span class="punctuation">:</span><span class="string">&quot;google&quot;</span> <span class="punctuation">,</span> <span class="attr">&quot;url&quot;</span><span class="punctuation">:</span><span class="string">&quot;www.google.com&quot;</span> <span class="punctuation">&#125;</span><span class="punctuation">,</span>  </span><br><span class="line">        <span class="punctuation">&#123;</span> <span class="attr">&quot;name&quot;</span><span class="punctuation">:</span><span class="string">&quot;百度&quot;</span> <span class="punctuation">,</span> <span class="attr">&quot;url&quot;</span><span class="punctuation">:</span><span class="string">&quot;www.baidu.com&quot;</span> <span class="punctuation">&#125;</span> </span><br><span class="line">    <span class="punctuation">]</span></span><br><span class="line"><span class="punctuation">&#125;</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>



<h4 id="JSON-布尔值"><a href="#JSON-布尔值" class="headerlink" title="JSON 布尔值"></a>JSON 布尔值</h4><p><strong>JSON 布尔值可以是 true 或者 false：</strong></p>
<figure class="highlight json"><table><tr><td class="code"><pre><span class="line"><span class="punctuation">&#123;</span> <span class="attr">&quot;flag&quot;</span><span class="punctuation">:</span><span class="literal"><span class="keyword">true</span></span> <span class="punctuation">&#125;</span></span><br></pre></td></tr></table></figure>



<h4 id="JSON-null"><a href="#JSON-null" class="headerlink" title="JSON null"></a>JSON null</h4><p><strong>JSON 可以设置 null 值：</strong></p>
<figure class="highlight json"><table><tr><td class="code"><pre><span class="line"><span class="punctuation">&#123;</span> <span class="attr">&quot;name&quot;</span><span class="punctuation">:</span><span class="literal"><span class="keyword">null</span></span> <span class="punctuation">&#125;</span></span><br></pre></td></tr></table></figure>



<p><strong>JSON 和 JavaScript 对象互转</strong></p>
<ul>
<li><p>要实现从JSON字符串转换为JavaScript 对象，使用 JSON.parse() 方法：</p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">var</span> obj = <span class="title class_">JSON</span>.<span class="title function_">parse</span>(<span class="string">&#x27;&#123;&quot;a&quot;: &quot;Hello&quot;, &quot;b&quot;: &quot;World&quot;&#125;&#x27;</span>); </span><br><span class="line"><span class="comment">//结果是 &#123;a: &#x27;Hello&#x27;, b: &#x27;World&#x27;&#125;</span></span><br></pre></td></tr></table></figure></li>
<li><p>要实现从JavaScript 对象转换为JSON字符串，使用 JSON.stringify() 方法：</p>
<figure class="highlight javascript"><table><tr><td class="code"><pre><span class="line"><span class="keyword">var</span> json = <span class="title class_">JSON</span>.<span class="title function_">stringify</span>(&#123;<span class="attr">a</span>: <span class="string">&#x27;Hello&#x27;</span>, <span class="attr">b</span>: <span class="string">&#x27;World&#x27;</span>&#125;);</span><br><span class="line"><span class="comment">//结果是 &#x27;&#123;&quot;a&quot;: &quot;Hello&quot;, &quot;b&quot;: &quot;World&quot;&#125;&#x27;</span></span><br></pre></td></tr></table></figure></li>
</ul>
<h4 id="fastjson-（pom-xml）"><a href="#fastjson-（pom-xml）" class="headerlink" title="fastjson （pom.xml）"></a>fastjson （pom.xml）</h4><figure class="highlight xml"><table><tr><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>com.alibaba<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>fastjson<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>1.2.60<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>



<h5 id="乱码统一解决"><a href="#乱码统一解决" class="headerlink" title="乱码统一解决"></a><strong>乱码统一解决</strong></h5><figure class="highlight xml"><table><tr><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">mvc:annotation-driven</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">mvc:message-converters</span> <span class="attr">register-defaults</span>=<span class="string">&quot;true&quot;</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">bean</span> <span class="attr">class</span>=<span class="string">&quot;org.springframework.http.converter.StringHttpMessageConverter&quot;</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">constructor-arg</span> <span class="attr">value</span>=<span class="string">&quot;UTF-8&quot;</span>/&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">bean</span> <span class="attr">class</span>=<span class="string">&quot;org.springframework.http.converter.json.MappingJackson2HttpMessageConverter&quot;</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;objectMapper&quot;</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="name">bean</span> <span class="attr">class</span>=<span class="string">&quot;org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean&quot;</span>&gt;</span></span><br><span class="line">                    <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;failOnEmptyBeans&quot;</span> <span class="attr">value</span>=<span class="string">&quot;false&quot;</span>/&gt;</span></span><br><span class="line">                <span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">mvc:message-converters</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">mvc:annotation-driven</span>&gt;</span></span><br></pre></td></tr></table></figure>



<h5 id="取消timestamps形式-，-自定义时间格式-封装工具类"><a href="#取消timestamps形式-，-自定义时间格式-封装工具类" class="headerlink" title="**取消timestamps形式 ， 自定义时间格式 **(封装工具类)"></a>**取消timestamps形式 ， 自定义时间格式 **(封装工具类)</h5><figure class="highlight java"><table><tr><td class="code"><pre><span class="line"><span class="keyword">package</span> com.guo.utils;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.fasterxml.jackson.core.JsonProcessingException;</span><br><span class="line"><span class="keyword">import</span> com.fasterxml.jackson.databind.ObjectMapper;</span><br><span class="line"><span class="keyword">import</span> com.fasterxml.jackson.databind.SerializationFeature;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.text.SimpleDateFormat;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">JsonUtils</span> &#123;</span><br><span class="line">    </span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> String <span class="title function_">getJson</span><span class="params">(Object object)</span> &#123;</span><br><span class="line">        <span class="keyword">return</span> getJson(object,<span class="string">&quot;yyyy-MM-dd HH:mm:ss&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> String <span class="title function_">getJson</span><span class="params">(Object object,String dateFormat)</span> &#123;</span><br><span class="line">        <span class="type">ObjectMapper</span> <span class="variable">mapper</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">ObjectMapper</span>();</span><br><span class="line">        <span class="comment">//不使用时间戳的方式</span></span><br><span class="line">        mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, <span class="literal">false</span>);</span><br><span class="line">        <span class="comment">//自定义日期格式对象</span></span><br><span class="line">        <span class="type">SimpleDateFormat</span> <span class="variable">sdf</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">SimpleDateFormat</span>(dateFormat);</span><br><span class="line">        <span class="comment">//指定日期格式</span></span><br><span class="line">        mapper.setDateFormat(sdf);</span><br><span class="line">        <span class="keyword">try</span> &#123;</span><br><span class="line">            <span class="keyword">return</span> mapper.writeValueAsString(object);</span><br><span class="line">        &#125; <span class="keyword">catch</span> (JsonProcessingException e) &#123;</span><br><span class="line">            e.printStackTrace();</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">null</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<figure class="highlight java"><table><tr><td class="code"><pre><span class="line"><span class="meta">@RequestMapping(&quot;/json&quot;)</span></span><br><span class="line"><span class="keyword">public</span> String <span class="title function_">json</span><span class="params">()</span> <span class="keyword">throws</span> JsonProcessingException &#123;</span><br><span class="line">    <span class="type">Date</span> <span class="variable">date</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Date</span>();</span><br><span class="line">    <span class="type">String</span> <span class="variable">json</span> <span class="operator">=</span> JsonUtils.getJson(date);</span><br><span class="line">    <span class="keyword">return</span> json;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="https://curry3035.gitee.io">PaulGeorge</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://curry3035.gitee.io/posts/3410/">https://curry3035.gitee.io/posts/3410/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://curry3035.gitee.io" target="_blank">Celts</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" href="/tags/%E6%95%B0%E6%8D%AE%E6%A0%BC%E5%BC%8F/">数据格式</a></div><div class="post_share"><div class="social-share" data-image="/img/avatar.jpg" data-sites="facebook,twitter,wechat,weibo,qq"></div><link rel="stylesheet" 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fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content is-expand"><ol class="toc"><li class="toc-item toc-level-4"><a class="toc-link" href="#%E4%BB%80%E4%B9%88%E6%98%AF-JSON%EF%BC%9F"><span class="toc-number">1.</span> <span class="toc-text">什么是 JSON？</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#JSON-%E6%95%B0%E7%BB%84"><span class="toc-number">2.</span> <span class="toc-text">JSON 数组</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#JSON-%E5%B8%83%E5%B0%94%E5%80%BC"><span class="toc-number">3.</span> <span class="toc-text">JSON 布尔值</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#JSON-null"><span class="toc-number">4.</span> <span class="toc-text">JSON null</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#fastjson-%EF%BC%88pom-xml%EF%BC%89"><span class="toc-number">5.</span> <span class="toc-text">fastjson （pom.xml）</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#%E4%B9%B1%E7%A0%81%E7%BB%9F%E4%B8%80%E8%A7%A3%E5%86%B3"><span class="toc-number">5.1.</span> <span class="toc-text">乱码统一解决</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#%E5%8F%96%E6%B6%88timestamps%E5%BD%A2%E5%BC%8F-%EF%BC%8C-%E8%87%AA%E5%AE%9A%E4%B9%89%E6%97%B6%E9%97%B4%E6%A0%BC%E5%BC%8F-%E5%B0%81%E8%A3%85%E5%B7%A5%E5%85%B7%E7%B1%BB"><span class="toc-number">5.2.</span> <span class="toc-text">**取消timestamps形式 ， 自定义时间格式 **(封装工具类)</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/posts/47231/" title="POI读取Excel问题">POI读取Excel问题</a><time datetime="2023-04-11T01:00:00.000Z" title="发表于 2023-04-11 09:00:00">2023-04-11</time></div></div><div class="aside-list-item 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